CompanyXYZ has asked you to assess the security of their perimeter email gateway. From your office in New York, you craft a specially formatted email message and send it across the Internet to an employee of CompanyXYZ. The employee of CompanyXYZ is aware of your test. Your email message looks like this:

From: jim_miller@companyxyz.com
To: michelle_saunders@companyxyz.com
Subject: Test message
Date: 4/3/2017 14:37

The employee of CompanyXYZ receives your email message. This proves that CompanyXYZ's email gateway doesn't prevent what?

A. Email Masquerading
B. Email Harvesting
C. Email Phishing
D. Email Spoofing